Larry in TN
En-Route
Why do you think it's a maintenance issue? Parts break. This is at least the fifth wheel departing incident this year.Sounds like a United maintenance issue.
Here are a few from Google, stolen from another forum, since 2020.
One in Jan 2020 but the pay wall prevents me from seeing any details.
An Air Canada A319 lost a wheel at LaGuardia in 2020.
A 747 Dreamlifter lost a wheel on takeoff in 2022.
Delta lost a nose wheel on a 757 in Atlanta in January.
United 777, March.
A military airplane Westover ARB, MA in February.
A FlySafair 737, April.
United 757, LAX, July.